JC Whitney replacement light set up? (was 5kst euro light conversion)

[Leah and David Mueller]

Sorry if I have missed part of this thread, or have misunderstood it, but I
cannot figure out from looking in my International JCW catalogue what lights
have been refered to. I see the round H4 and H1 replacements, but it sounds
like there is another choice? I understand the Euro light drop ins available
from other supplies like Bosch and Hella and the like, but still not sure of
the JCW alternative (if there is one.)  Thank you for your reponses

David